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Isotope investigation of mercury sources in a creek impacted by multiple anthropogenic activities
Chemosphere ( IF 8.8 ) Pub Date : 2021-05-21 , DOI: 10.1016/j.chemosphere.2021.130947
Saebom Jung 1 , Sae Yun Kwon 2 , Yongseok Hong 3 , Runsheng Yin 4 , Laura C Motta 1
Affiliation  

To investigate mercury (Hg) sources responsible for contamination at Gumu Creek in South Korea, Hg concentration (THg) and Hg isotope ratios were measured in the soil and sediment of Gumu Creek and the samples from a hazardous waste landfill (HWL). The THg ranged between 0.29–327 mg kg−1 and 9.5–414 mg kg−1 in the soil and sediment, respectively, reflecting heterogeneous distribution and elevated levels across the entire Gumu Creek. Without the soil with the lowest THg (0.30 ± 0.01 mg kg−1, n = 3), the δ202Hg (−0.83 to −0.18‰) and Δ199Hg (−0.24 to 0.01‰) of the sediment and soil of Gumu Creek were within the ranges of the HWL samples (δ202Hg; −1.29 to −0.38‰, Δ199Hg; −0.31 to 0.01‰). The comparison with the literature reporting sediment Hg isotope ratios impacted by various anthropogenic Hg sources revealed a presence of diverse Hg sources at Gumu Creek, including commercial liquid Hg, phenyl-Hg, and fly ash, consistent with the types of waste deposited within the HWL. Using commercial liquid Hg, fly ash, and the soil with the lowest THg as end-members, the ternary mixing model yielded 25–88% and 12–57% contributions from commercial liquid Hg and fly ash to the Gumu Creek sediment, respectively. The results of our study suggest that Hg isotope ratios are an effective tool for screening potential Hg sources at sites where the distribution of Hg is heterogeneous and multiple anthropogenic activities exist.



中文翻译:

受多种人为活动影响的小溪中汞源的同位素调查

为了调查导致韩国 Gumu Creek 污染的汞 (Hg) 源,测量了 Gumu Creek 的土壤和沉积物以及来自危险废物填埋场 (HWL) 的样品中的汞浓度 (THg) 和 Hg 同位素比率。土壤和沉积物中的 THg 分别介于 0.29-327 mg kg -1和 9.5-414 mg kg -1之间,反映了整个古木溪的异质分布和升高的水平。如果没有最低 THg (0.30 ± 0.01 mg kg -1 , n = 3) 的土壤,则沉积物和土壤的δ 202 Hg (-0.83 to -0.18‰) 和 Δ 199 Hg (-0.24 to 0.01‰) Gumu Creek 在 HWL 样本的范围内 (δ 202 Hg; -1.29 到 -0.38‰, Δ 199汞;-0.31 至 0.01‰)。与报告受各种人为汞源影响的沉积物汞同位素比率的文献进行比较,揭示古木溪存在多种汞源,包括商业液态汞、苯基汞和飞灰,与沉积在 HWL 内的废物类型一致. 使用商业液态汞、粉煤灰和具有最低 THg 的土壤作为端元,三元混合模型分别产生了 25-88% 和 12-57% 的商业液态汞和粉煤灰对 Gumu Creek 沉积物的贡献。我们的研究结果表明,在汞分布不均匀且存在多种人为活动的地点,汞同位素比率是筛选潜在汞源的有效工具。

更新日期:2021-06-11
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